Use zip to replicate argb values out to 16 bits BUG=186 TEST=Shade Review URL: https://webrtc-codereview.appspot.com/986004
Use zip to replicate argb values out to 16 bits
BUG=186
TEST=Shade
Review URL: https://webrtc-codereview.appspot.com/986004

git-svn-id: a51711482b6ba0e1d1ab095578a045eeae45ac9a@517 16f28f9a-4ce2-e073-06de-1de4eb20be90

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